Summary of 3GPP TR 26.501 Change Request
Document Information
- CR Number: S4-260253
- Specification: TR 26.958 v0.1.1
- Work Item: FS_3DGS_MED (Study on 3D Gaussian Splatting for Media)
- Category: B (addition of feature)
- Release: Rel-20
Main Objective
This CR proposes to add a new clause (6.X) to TR 26.958 addressing the mapping of 3D Gaussian Splatting (3DGS) services to 3GPP 5G QoS Identifier (5QI) parameters as specified in TS 23.501.
Technical Contributions
Background on 5QI (Clause 6.X.1)
The CR provides a comprehensive table of relevant pre-defined 5QI values from TS 23.501 that have similar QoS characteristics to 3DGS services, including:
- GBR Resources:
- 5QI 1-4: Conversational voice/video, real-time gaming, buffered streaming (PDB: 50-300ms, PER: 10⁻² to 10⁻⁶)
- 5QI 71-76: Live uplink streaming (PDB: 300-500ms, PER: 10⁻⁴ to 10⁻⁸)
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5QI 80: Low latency eMBB/AR applications (PDB: 10ms, PER: 10⁻⁶)
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Delay-Critical GBR:
- 5QI 88: Motion tracking data, split AI/ML inference (PDB: 10ms, PER: 10⁻³)
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5QI 89-90: Visual content for cloud/edge/split rendering (PDB: 15-20ms, PER: 10⁻⁴)
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Non-GBR Resources:
- 5QI 5-10: IMS signaling, buffered streaming, interactive gaming (PDB: 100-1100ms)
3DGS Application Flows for 5QI Mapping (Clause 6.X.2)
The CR identifies distinct application flows requiring QoS treatment:
- Delivery of 3DGS media content application flows
- Delivery from/to UE of static 3DGS scene content
- Delivery from network to UE of dynamic or view-based 3DGS content
- Delivery of user pose, gaze information, LOD information from UE to network for network-assisted rendering or delivery
Recommendations (Clause 6.X.3)
The CR establishes the following recommendations for the study outcome:
- Mapping Identification: A mapping of 3DGS application flows to appropriate 5QI values should be identified
- Reference 5QI Values: Existing 5QI values (from clause 6.X.1) with similar QoS/QoE expectations and RAN resource priority should be used as reference for determining appropriate 5QI values and QoS characteristics limits for 3DGS services
- New 5QI Definition: If existing 5QI values are insufficient, liaison with appropriate 3GPP groups (likely SA2) should be initiated to define new 5QI values and corresponding QoS characteristics specifically for 3DGS services
Rationale
The CR addresses a gap in the FS_3DGS_MED study by providing guidance on how 3DGS services should be treated within the 5G System QoS framework, ensuring proper traffic handling behavior through appropriate QoS Flow configuration.